Lower die assembly and press quenching die

Abstract

The present application relates to a lower die assembly and a press quenching die, which are applied to a press quenching device for gears. The lower die assembly includes a plurality of lower die monomers. Among them, each lower die monomer includes a head end and a tail end which are oppositely arranged, and the head ends and tail ends of the respective lower die monomers are connected end to end in sequence to jointly form a closed annular lower die body. Further, the head ends and tail ends are arranged oppositely along the circumferential direction of the lower die body, and a bearing surface for bearing the gear is constructed on one end surface in the axial direction of the lower die body. In the lower die assembly and the press quenching die of the present application, the surface precision stability of the bearing surface of the lower die body is higher, and the yield stability of the gear in the press quenching process is improved.

Description

Technical Field

[0001] The present application relates to the technical field of the press quenching process of gears, and particularly to a lower die assembly and a press quenching die. Background Art

[0002] In order to improve the strength and hardness of gears, it is usually necessary to perform press quenching on the gears, and the quenching press is a key device for heat treatment press quenching processing. Among them, the lower die of the quenching press is one of the important components for suppressing gear deformation and ensuring gear accuracy.

[0003] The lower die of the traditional quenching press is usually a disc-shaped structure composed of multiple coaxially sleeved annular units. However, during the press quenching process of the gears, due to the superposition of stresses such as tissue stress, internal stress, and thermal stress, the annular units of the lower die are prone to fracture or deformation, thereby affecting the surface accuracy of the gears and causing problems such as out-of-tolerance of gear plane deformation. The yield rate of the gears will show unstable fluctuations. Therefore, when using the lower die of the traditional quenching press for the press quenching process of gears, there is a problem of poor yield stability of the gears. Summary of the Invention

[0004] Based on this, it is necessary to provide a lower die assembly and a press quenching die for the problem of poor yield stability of gears in the current press quenching process.

[0005] On the one hand, the present application provides a lower die assembly applied to a gear press quenching device. The lower die assembly includes a plurality of lower die monomers. Among them, each lower die monomer includes a head end and a tail end arranged opposite to each other, and the head ends and tail ends of each lower die monomer are connected end to end in sequence to jointly form a closed annular lower die body. Further, each head end and tail end are arranged opposite to each other along the circumferential direction of the lower die body, and one end face in the axial direction of the lower die body is constructed with a bearing surface for bearing the gear.

[0006] In one embodiment, a first connecting portion and a second connecting portion are respectively arranged at the head end and the tail end of each lower die monomer. Among two adjacent lower die monomers, the first connecting portion of one lower die monomer is in snap-fit connection with the second connecting portion of the other lower die monomer, so that each lower die monomer is connected in sequence.

[0007] In one embodiment, the first connecting portion is constructed as a groove-shaped structure, and the second connecting portion is constructed as a block-shaped structure adapted to the groove-shaped structure.

[0008] In one embodiment, the two end faces of each lower die monomer along the axial direction of the lower die body are respectively defined as a first surface and a second surface, and each second surface forms the bearing surface of the lower die body. Further, a first supporting portion and a second supporting portion are arranged on each first surface of each lower die monomer, and the distance between the first supporting portion and the center of the lower die body is less than the distance between the second supporting portion and the center of the lower die body.

[0009] In one embodiment, a third support portion is further provided on the first surface of each lower die monomer, and the second support portion and the third support portion are located on the same circle centered at the center of the lower die body.

[0010] In one embodiment, the end faces of the first support portion, the second support portion, and the third support portion away from the first surface are all configured as arc surface structures.

[0011] In one embodiment, the first support portion, the second support portion, and the third support portion are all arc-shaped convex blocks protruding from the first surface.

[0012] In one embodiment, a plurality of first oil guide grooves are arranged at intervals on the second surface of each lower die monomer, and each first oil guide groove extends along the radial direction of the lower die body.

[0013] In one embodiment, each lower die monomer includes a first end face, and both ends of the first end face are connected between the head end and the tail end of the lower die monomer. Further, the first end faces are mutually pieced together to form the radially outer side face of the lower die body, and along the axial direction of the lower die body, the first end face is configured as an arc surface structure protruding radially outward.

[0014] In one embodiment, the head end face and the tail end face of each lower die monomer both extend along the radial direction of the lower die body.

[0015] On the other hand, the present application provides a press quenching die, including the lower die assembly in any of the above embodiments.

[0016] In the above lower die assembly and press quenching die, a plurality of lower die monomers are arranged in sequence along the circumferential direction of the lower die body, and each lower die monomer is an integral structure along the radial direction of the lower die body. Compared with the traditional lower die body formed by coaxially sleeving a plurality of circular ring-shaped units, the circumferential length of the lower die monomer in the present application is shorter, and the radial width is wider. Therefore, it is not easy to break or deform during the press quenching process. Furthermore, the lower die body jointly pieced together by a plurality of lower die monomers is also not easy to break or deform, making the surface accuracy of the bearing surface of the lower die body more stable, thereby greatly improving the yield stability of gears in the press quenching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the lower die body of the lower die assembly provided by the present application from the first perspective.

[0018] Figure 2 It is a schematic structural diagram of the lower die body of the lower die assembly provided by the present application from the second perspective.

[0019] Figure 3 It is a schematic structural diagram of the lower die monomer of the lower die assembly provided by the present application.

[0020] Figure 4 It is a plan view of the end of the lower die unit in the lower die assembly provided by this application.

[0021] Figure 5 It is a plan view of the first surface of the lower die unit in the lower die assembly provided by this application.

[0022] Reference numerals in the drawings: 10 - lower die body; 11 - lower die unit; 11a - head end; 11b - tail end; 11c - first surface; 11d - second surface; 11e - first end face; 111 - first connecting portion; 112 - second connecting portion; 113 - first supporting portion; 114 - second supporting portion; 115 - third supporting portion; 116 - first oil guiding groove; 117 - second oil guiding groove; 118 - avoiding groove. Detailed implementation manners

[0023] To make the above objects, features, and advantages of this application more obvious and understandable, the following will describe the detailed implementation manners of this application in conjunction with the drawings. Many specific details are set forth in the following description to fully understand this application. However, this application can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of this application. Therefore, this application is not limited by the specific embodiments disclosed below.

[0024] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of this application.

[0025] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, if the term "plural" appears, the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0026] In this application, unless otherwise clearly specified or limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In this application, unless otherwise clearly specified or limited, if there is a description such as the first feature being "on" or "under" the second feature, its meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or just means that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or just means that the first feature is at a lower level than the second feature in terms of horizontal height.

[0028] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0029] In order to improve the strength and hardness of gears, it is usually necessary to perform press quenching on the gears, and the quenching press is a key equipment for heat treatment press quenching processing.

[0030] Taking the driven bevel gear of an automotive rear axle as an example, the driven bevel gear is a core component of the automotive axle assembly, and it has high requirements for strength, hardness, precision, etc. The quenching press is a special equipment for quenching and cooling after carburizing and quenching the heat treatment of the driven bevel gear. The quenching press is usually equipped with an upper die adapted to the shape of the top plane of the driven bevel gear and a lower die adapted to the shape of the bottom plane of the driven bevel gear. During the press quenching process, the driven bevel gear is placed between the upper die and the lower die, and the surface of the lower die adapted to the shape of the bottom plane of the driven bevel gear supports the bottom plane of the driven bevel gear. However, the product yield of the driven bevel gear quenched by this quenching press is often unstable, and it is easy to produce the problem of out-of-tolerance deformation of the heat treatment press quenching processing plane of the driven bevel gear, resulting in the attenuation of the precision of the produced driven bevel gear and seriously affecting the assembly quality of the automotive axle assembly.

[0031] After repeated research, it is found that there is a correlation between the out-of-tolerance deformation of the press quenching processing plane of the driven bevel gear and the lower die of the quenching press. The traditional lower die is usually composed of multiple circular ring-shaped units sleeved coaxially and jointly combined into a disc-shaped structure. One surface of the disc-shaped structure of the lower die along the axial direction is used to support the bottom plane of the driven bevel gear. In the press quenching process of the driven bevel gear, due to the superposition of stress such as tissue stress, internal stress and thermal stress, the circular ring-shaped units of the lower die are prone to fracture or deformation. When the circular ring-shaped units of the lower die are fractured or deformed, it will directly lead to the out-of-tolerance deformation of the heat treatment press quenching processing plane of the driven bevel gear and affect the stability of its yield.

[0032] Therefore, based on the problem of poor yield stability of gears in the current press quenching process, the present application provides a lower die assembly and a press quenching die.

[0033] Refer to Figures 1 to 3 , Figure 1 shows a schematic structural diagram of the lower die body of the lower die assembly in a first perspective in an embodiment of the present application, Figure 2 shows a schematic structural diagram of the lower die body of the lower die assembly in a second perspective in an embodiment of the present application, Figure 2 shows a schematic structural diagram of the lower die monomer of the lower die assembly in an embodiment of the present application. The lower die assembly provided in an embodiment of the present application is applied to a press quenching device for gears. It can be understood that the lower die assembly provided in the present application includes but is not limited to being applied to a press quenching device for driven bevel gears, and this press quenching device also includes but is not limited to a quenching press.

[0034] Specifically, the lower die assembly includes a plurality of lower die units 11. Each lower die unit 11 includes a head end 11a and a tail end 11b which are oppositely arranged. The head ends 11a and tail ends 11b of each lower die unit 11 are connected end to end in sequence to jointly form a closed-ring-shaped lower die body 10. The head ends 11a and tail ends 11b are arranged oppositely along the circumferential direction of the lower die body 10. One end face in the axial direction of the lower die body 10 is configured with a bearing surface for bearing the gear.

[0035] In this embodiment, the head ends 11a and tail ends 11b of each lower die unit 11 of the lower die assembly are connected end to end in sequence to jointly form a closed-ring-shaped lower die body 10, and the head ends 11a and tail ends 11b of each lower die unit 11 are arranged oppositely along the circumferential direction of the lower die body 10, that is, each lower die unit 11 is connected in sequence along the circumferential direction of the lower die body 10. One surface of each lower die unit 11 along the axial direction of the lower die body 10 jointly forms a bearing surface for bearing the gear. In this way, a plurality of lower die units 11 are arranged in sequence along the circumferential direction of the lower die body 10, and each lower die unit 11 is an integral structure along the radial direction of the lower die body 10. Compared with the traditional lower die body formed by coaxially sleeving a plurality of circular ring-shaped units, the circumferential length of each lower die unit 11 is shorter than that of the circular ring-shaped unit along the circumferential direction of the lower die body 10, and the radial width along the lower die body 10 is wider. Therefore, the structural strength of the lower die unit in this application is higher. Therefore, the lower die unit 11 in this application is not easily broken or deformed during the press quenching process. Furthermore, the lower die body 10 jointly formed by a plurality of lower die units 11 is not easily broken or deformed, and the surface accuracy of the bearing surface of the lower die body 10 is more stable, thus greatly improving the yield stability of the gear in the press quenching process.

[0036] Further, in some embodiments, referring to Figures 1 to 3 , a first connection portion 111 and a second connection portion 112 are respectively arranged at the head end 11a and the tail end 11b of each lower die unit 11. Among two adjacent lower die units 11, the first connection portion 111 of one lower die unit 11 is in snap-fit connection with the second connection portion 112 of the other lower die unit 11 to enable the connection of each lower die unit 11 in sequence. Since the first connection portion 111 and the second connection portion 112 are respectively arranged at the head end 11a and the tail end 11b of each lower die unit 11, and the two adjacent lower die units 11 forming the lower die body 10 are both in snap-fit connection through the first connection portion 111 and the second connection portion 112, the first connection portion 111 and the second connection portion 112 provide a locking force along the radial direction of the lower die body 10 to the two adjacent lower die units 11, making it difficult for the two adjacent lower die units 11 to be misaligned along the radial direction of the lower die body 10, eliminating the risk of reducing the planar accuracy of the bearing surface of the entire lower die body 10 due to the radial misalignment of the lower die unit 11, and further ensuring the yield of the gear in the press quenching process.

[0037] Specifically, it can be implemented. In some embodiments, refer to Figure 3 , the first connecting portion 111 is configured as a groove-like structure, and the second connecting portion 112 is configured as a block-like structure adapted to the groove-like structure. The structure is simple, and the assembly of each lower die monomer 11 is convenient and fast. Exemplarily, along the radial direction of the lower die body 10, the size of the block-like second connecting portion 112 is slightly smaller than the size of the groove-like first connecting portion 111.

[0038] In some embodiments, the two end faces of each lower die monomer 11 along the axial direction of the lower die body 10 are respectively defined as a first surface 11c and a second surface 11d. Refer to Figures 1 to 5 , Figure 4 shows a plan view of the tail end of the lower die monomer 11 in the lower die assembly in an embodiment of the present application, Figure 5 shows a plan view of the first surface 11c of the lower die monomer in the lower die assembly in an embodiment of the present application. The second surfaces 11d are joined together to form the bearing surface of the lower die body 10. The first surface 11c of each lower die monomer 11 is provided with a first support portion 113 and a second support portion 114. Among them, the distance between the first support portion 113 and the center of the lower die body 10 is less than the distance between the second support portion 114 and the center of the lower die body 10. The first surface 11c of each lower die monomer 11 is provided with a first support portion 113 and a second support portion 114. In this way, when a plurality of lower die monomers 11 are jointly joined to form a closed-ring lower die body 10, the first support portion 113 and the second support portion 114 on each lower die monomer 11 respectively form supports at different positions along the radial direction of the lower die body 10 to ensure the planar accuracy of the bearing surface of the lower die body 10.

[0039] In order to further improve the planar accuracy of the bearing surface and ensure the stability of the lower die body 10 on the press quenching device, in some embodiments, the first surface 11c of each lower die monomer 11 is further provided with a third support portion 115. The second support portion 114 and the third support portion 115 are located on the same circle centered on the center of the lower die body 10. At this time, the first support portion 113, the second support portion 114 and the third support portion 115 on each lower die monomer 11 jointly form a three-point support, greatly improving the stability of the lower die monomer 11, and further ensuring the stability of the bearing surface of the lower die body 10.

[0040] In some embodiments, refer to Figure 5, the second support portion 114 and the third support portion 115 can be symmetrically arranged with respect to a first straight line (not shown in the figure), wherein the first straight line passes through the center of the lower die body 10 and the center of the first support portion 113. Exemplarily, the structures of the first support portion 113, the second support portion 114, and the third support portion 115 can be the same. Along the axial direction of the lower die body 10, the cross-sections of the three can be constructed as rectangular structures. The center lines of the second support portion 114 and the third support portion 115 are located on the same straight line, and the center lines of the two are parallel to the center line of the first support portion 113. It can be understood that the structures of the first support portion 113, the second support portion 114, and the third support portion 115 can also be different, and the cross-sections of the three can also be constructed as other structures, as long as the support functions of the three can be satisfied.

[0041] In actual application, the first surfaces 11c of the first support portion 113, the second support portion 114, and the third support portion 115 are all placed on the working platform set for press quenching. More specifically, a lifting mechanism is arranged in the working platform. The first support portion 113 is placed on the lifting mechanism in the working platform, and the second support portion 114 and the third support portion 115 are placed on the working platform outside the lifting mechanism. When the surface unevenness of the bearing surface of the lower die body 10 is inconsistent with the surface unevenness of the bottom plane of the gear, the lifting of the lifting mechanism drives the first support portion 113 to rise or fall, while the positions of the second support portion 114 and the third support portion 115 remain unchanged, so as to realize the adjustment of the surface unevenness of the lower die body 10 to adapt to the surface shape of the produced gear.

[0042] In some embodiments, the end faces of the first support portion 113, the second support portion 114, and the third support portion 115 away from the first surface 11c are all constructed as arc surface structures, so that when adjusting the surface unevenness of the bearing surface of the lower die body 10, the first support portion 113, the second support portion 114, and the third support portion 115 can always have linear contact with the working platform set for press quenching, ensuring smoothness.

[0043] Exemplarily, along the radial direction of the lower die body 10, the distance between the middle of the arc surface structure and the first surface 11c is greater than the distances between the two sides of the arc surface structure and the first surface 11c. Preferably, the arc surface structure is a centrally symmetric structure, and the distances between its two sides and the first surface 11c are equal.

[0044] For ease of processing, specifically achievable, the first support portion 113, the second support portion 114, and the third support portion 115 are all arc-shaped bumps convexly provided on the first surface 11c. Exemplarily, the first support portion 113, the second support portion 114, and the third support portion 115 can be respectively welded, bolted, or clamped to the first surface 11c, or the first support portion 113, the second support portion 114, and the third support portion 115 can also be integrally formed on the first surface 11c of the lower die unit 11.

[0045] Referring to Figure 1 and Figure 4 , in some embodiments, each lower die unit 11 includes a first end face 11e, and both ends of the first end face 11e are connected between the head end 11a and the tail end 11b of the lower die unit 11. Each first end face 11e is mutually pieced together to form the radially outer side face of the lower die body 10. Along the axial direction of the lower die body 10, the first end face 11e is configured as an arc surface structure protruding radially outward. Usually, a circular cavity is recessed on the workbench surface of the press quenching device to place the lower die assembly, and the circular cavity is adapted to the shape of the lower die body 10. When adjusting the surface unevenness of the bearing surface of the lower die body 10, there will be a certain angular change of the first end face 11e of each lower die unit 11 relative to the workbench surface. Configuring the first end face 11e as an arc surface structure protruding radially outward can avoid interference between the first end face 11e and the inner side wall of the circular cavity.

[0046] In some embodiments, referring to Figures 1 to 5 , the end faces of the head end 11a and the tail end 11b of each lower die unit 11 both extend along the radial direction of the lower die body 10. This not only has a simple structure but also can minimize the circumferential length of each lower die unit 11 along the lower die body 10 and increase the radial width of each lower die unit 11 along the lower die body 10, improving the structural strength of each lower die unit 11 and avoiding deformation or fracture during the press quenching process, which affects the yield of the processed gears.

[0047] This application does not limit the specific dimensions of each lower die unit 11, as long as the lower die body 10 formed by piecing together multiple lower die units 11 is adapted to the size of the processed gear. This application also does not limit the specific number of lower die units 11 that make up the lower die body 10, as long as it can achieve the function of being pieced together into a closed annular lower die body 10 and is adapted to the size and shape of the processed gear.

[0048] Exemplarily, the number range of the lower die units 11 that make up the lower die body 10 can be 8 - 20. Preferably, the number of lower die units 11 can be 10. It can be understood that in this application, the number of lower die units 11 that make up a lower die body 10 can also be 8, 9, 11, 12, or other numbers.

[0049] Further, referring to Figure 1 , in some embodiments, a plurality of first oil guide grooves 116 are spaced on the second surface 11d of each lower die unit 11, and each first oil guide groove 116 extends along the radial direction of the lower die body 10, so that the quenching oil is evenly distributed on the bearing surface of the lower die body 10, so that the cooling rates of all parts of the gear are kept consistent during the quenching process, and the quenching quality of the gear is improved.

[0050] Exemplarily, referring to Figure 3 , a second oil guide groove 117 extending along the circumferential direction of the lower die body 10 may further be provided on the second surface 11d of each lower die unit 11. The second oil guide grooves 117 of the plurality of lower die units 11 constituting the lower die body 10 commonly form a circular oil guide groove on the bearing surface, and the circular oil guide groove is communicated with the plurality of first oil guide grooves 116, so as to improve the flow rate of the quenching oil in the first oil guide grooves 116 and improve the effect of uniform cooling. Exemplarily, along the direction from the center to the edge of the lower die body 10, the second oil guide groove 117 may be located at any position of 1 / 4-1 / 2 of the radius of the lower die unit 11.

[0051] Referring to Figure 2 and Figure 5 , in some embodiments, an avoidance groove 118 may further be provided on the first surface 11c of each lower die unit 11 to avoid interference with the working platform of the press quenching device.

[0052] In some embodiments, the lower die assembly of the present application may further include an expander (not shown in the figure) and a support seat (not shown in the figure) for supporting the expander. A central hole is formed in the center of the closed annular lower die body 10, and the support seat and the expander are installed at the central hole. Exemplarily, referring to Figure 3 and Figure 4 , a stepped structure is provided at each lower die unit 11 near the central hole to avoid interference with the support seat.

[0053] On the other hand, the present application also provides a press quenching die, which includes the lower die assembly in any of the above embodiments. The lower die assembly in this press quenching die includes a plurality of lower die monomers 11. Each lower die monomer 11 includes a head end 11a and a tail end 11b that are oppositely arranged. The head ends 11a and tail ends 11b of each lower die monomer 11 are connected end to end in sequence to jointly form a closed annular lower die body 10. The head ends 11a and tail ends 11b are arranged oppositely along the circumferential direction of the lower die body 10. One axial end face of the lower die body 10 is configured with a bearing surface for bearing the gear. Compared with the traditional lower die body 10 formed by coaxially sleeving a plurality of circular ring-shaped units, each lower die monomer 11 in the present application is shorter in the circumferential direction of the lower die body 10 and wider in the radial direction of the lower die body 10. Therefore, each lower die monomer 11 is not easily broken or deformed during the press quenching process. Furthermore, the lower die body 10 jointly formed by a plurality of lower die monomers 11 is also not easily broken or deformed, greatly improving the yield stability of the gear in the press quenching process.

[0054] Exemplarily, the press quenching die of the present application may further include an upper die assembly. During press quenching, the processed gear is located between the upper die assembly and the lower die assembly. Specifically, the bottom plane of the gear is located on the bearing surface of the lower die body 10.

[0055] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0056] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A lower die assembly, applied to a press quenching device for gears, is characterized in that The lower die assembly includes a plurality of lower die units; Each of the lower die units includes a head end and a tail end which are oppositely arranged. The head ends and tail ends of the lower die units are connected end to end in sequence to jointly form a closed annular lower die body. The head ends and the tail ends are arranged oppositely along the circumferential direction of the lower die body. One end face in the axial direction of the lower die body is configured with a bearing surface for bearing the gear.

2. The lower die assembly according to claim 1, characterized in that The head ends and tail ends of each of the lower die units are respectively provided with a first connecting portion and a second connecting portion. Among two adjacent lower die units, the first connecting portion of one of the lower die units is in snap-fit connection with the second connecting portion of the other lower die unit, so that the lower die units are connected in sequence.

3. The lower die assembly according to claim 2, wherein The first connecting portion is configured as a groove-like structure, and the second connecting portion is configured as a block-like structure adapted to the groove-like structure.

4. The lower die assembly according to claim 1, wherein The two end faces of each of the lower die units along the axial direction of the lower die body are respectively defined as a first surface and a second surface. The second surfaces are joined together to form the bearing surface of the lower die body; The first surface of each of the lower die units is provided with a first supporting portion and a second supporting portion. The distance between the first supporting portion and the center of the lower die body is less than the distance between the second supporting portion and the center of the lower die body.

5. The lower die assembly according to claim 4, characterized in that, The first surface of each of the lower die units is further provided with a third supporting portion. The second supporting portion and the third supporting portion are located on the same circle with the center of the lower die body as the center of the circle.

6. The lower die assembly according to claim 5, characterized in that The end faces of the first supporting portion, the second supporting portion and the third supporting portion away from the first surface are all configured as arc surface structures.

7. The lower die assembly according to claim 5, characterized in that, The first supporting portion, the second supporting portion and the third supporting portion are all arc-shaped convex blocks protruding from the first surface.

8. The lower die assembly according to claim 4, characterized in that, A plurality of first oil guiding grooves are arranged at intervals on the second surface of each of the lower die units. Each of the first oil guiding grooves extends along the radial direction of the lower die body.

9. The lower die assembly according to claim 1, wherein, Each of the lower die units includes a first end face. The two ends of the first end face are connected between the head end and the tail end of the lower die unit; The first end faces are joined together to form the radially outer side face of the lower die body. Along the axial direction of the lower die body, the first end face is configured as an arc surface structure protruding radially outward.

10. The lower die assembly according to claim 1, wherein The head end face and the tail end face of each of the lower die units both extend along the radial direction of the lower die body.

11. A press quenching die, characterized in that, It includes the lower die assembly according to any one of claims 1-9.

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